Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Fixed maturity collateral pledged to FHLB	$ 1,182	$ 1,211
FHLB restricted stock	54	55
Trading securities	53	48
Cash and cash equivalents	14	12
Total restricted assets	2,130	2,734
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged	827	1,408
Securities pledged as collateral
Loss Contingencies [Line Items]
Fair value of loaned securities	546	1,159
Securities delivered as collateral	194	183
Securities Pledged under repurchase agreements, carrying value	87	66
Securities Loaned
Loss Contingencies [Line Items]
Securities delivered as collateral	$ 194	$ 183

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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